Construction member



43: DORNIER. comsraucnow, MEMBER.

APPLICATSON FILED JUNE 28, I920.

l ,4: 1 9,82? u I Piztfinted J 11119 1.3, 1922.

Fa Z;

CLAUDIUS DORNIER, OF FRIEDRICHSHAFEN, GERMANY, ASSIGNOR '10 THE FIRM" oFiEZ.

LUFTSCHIFFBAU ZEPPELIN GESELLSCHAFT MIT BESGHRANKTER HAFTUNG,

FRIEDRICHSHAFEN, GERMANY.

CONSTRUCTION MEMBER.

Application filed June 28,

T all whomit may concern:

Be it known that I, CLAUnIUs DORNIER, a

,citizen of the German Empire, residing at Friedrichshafen. Germany,haveinventedcertaln new and useful Improvements 1n Construction Members (forwhich I have made application in Germany, August 31, 1916), of which thefollowing is a specification. My invention refers to constructionmembersand more particularly to a metallic member of especially usefulqualities.

It is a well known fact that wherever it is a quest-ion of utilizingmaterial to the utmost, endeavours are made to use box beam sections inplace of rolled section-girders.

My invention refers to a particularly advantageous type of cross-sectionfor weightbearlng constructional parts of high-class material, thereforcomparatively small cross-sections.

wholly closed shape, a considerably greater. safety against buckling isvouchsafed than in the usual open box section. without the possibilitiesof connecting-on being thereby reduced. I

The novel member willprove useful wherever small weights must be strivenfor, thus for instance in portable buildings, such as air-ship sheds andmore especially in the constructionof'air-craft and ships.

In air-craft construction the object of'my present invention is mainlysuited for cross beams, longitudinal girders and the like. A

particularly advantageous mode of employment is found forthis'constructional part in the ribs of ships hulls, floating and otherhollow bodies made of steel or light-metal,

the shell of these bodiesat the same time forming the one boom of thegirder.

Specification of Letters Patent. I Pat enteid, June 13, 1922,

1920. Serial No. 392,558.

Figs. 3 and 4 illustrate two modifications of a construction member inaccordance with the invention. I

Fig. 3 is a section' of the supporting plane of a flying-machine fromwhich the application'of the invention as a cross-beam may be gathered.

Fig: 4 gives anexample fromship-building, the invention being applied toa longitudinal rib.

I claimz' 1. A sheet metal girder of triangular section comprising incombination, a pair of converging sheet metal strips fixed to oneanother alongtheir abutting edges,the free edges being bent outwards soas to extend in line with one another, and'a base plate 'of sheet metal,of superior thickness fixed to' and connecting said bent edges.

2 A sheet metal girder of'triangular section comprising in combination,a pair of converging sheet metal s'trips, each strip being bentlongitudinally so as to present a C-section, arivet connection betweenthe abut-ting faces of said strips and a; base plate of sheet metal ofsuperior thickness riveted to and connecting the diverging edges of saidstrips.

3. A sheet metal girder of triangular section comprising in combination,a pair of converging sheet metal strips, a reinforcing stripintermediate and fixed to the converging edges of said strips, the freeedges of said strips being bent outwards so as to extend in line withoneanother and a base plate of sheet metal of superior thickness fixedto and connecting said bent edges.

4. A sheet metal girder of triangular secconverging sheet metal stripsfixed to one another along their abutting edges, the free edgesbeing'bent outwards so as to extend in line with one another, and a baseplate of sheet metal of superior thickness fixed toand connecting saidbent edges, said base plate forming part of the walls of a hollow body.

In testimony whereof I ailix my signature.

oLAuDIUs DORNIER.

H tion comprising in combination, a pair of

